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A dense cluster of busy spiny ants each about 10mm long.
Found on a eucalyptus sapling about 2m above ground in dry, open forest.
Wicks Nature Reserve.
These usually stay near the ground but activity was intense at this leaf axil meaning there was a serious attractant. Probably something like a scale bug or leaf hopper nymph was exuding nectar but I could not get the cluster of ants to disperse properly. They got very aggressive when I tried.
They spray formic acid from a small circular hole at the tip of the gaster.
This Polyrhachis species has only one pair of strong spines at the rear of the mesosoma.
Lat: -37.86, Long: 145.32
Spotted on Oct 7, 2017
Submitted on Oct 9, 2017
and 8 other people favorited this spotting